A183363 Number of n X n binary arrays with no element equal to the sum mod 3 of its horizontal and vertical neighbors

1, 3, 18, 138, 3102, 137688, 12617557, 2402945556, 936460285557, 739951660291721

Offset

1,2

Comments

Diagonal of A183368

Links

Table of n, a(n) for n=1..10.

Example

Some solutions for 5X5
..1..0..0..1..1....1..1..1..0..0....1..1..1..1..0....1..1..0..0..1
..0..0..1..1..1....1..0..1..0..1....1..0..0..1..0....1..1..1..0..0
..1..0..1..0..1....1..1..1..0..0....1..0..0..1..1....1..0..1..1..1
..0..0..1..1..1....0..0..1..1..1....1..1..1..1..1....1..1..0..1..1
..1..0..1..1..1....1..0..1..1..1....1..1..0..0..0....0..1..1..1..0

Crossrefs

Sequence in context: A275549 A357403 A039618 * A216492 A127129 A186266

Adjacent sequences: A183360 A183361 A183362 * A183364 A183365 A183366

Keyword

nonn

Author

R. H. Hardin Jan 04 2011

Status

approved